Lift-jack.



J. 11. BURKHOLDER. LIFT JACK.

APPLICATION FILED SEPT. 11,1912.

2 SHEETS-SHEET 1.

. m H.BvRK HOLDER Him. BY ATTYs.

I. H. BURKHOLDEB. LIFT JACK.

uruonxox run an. 11,1912.

1,097,581. Patented May 19, 19m

2 BKEETHHEBT 2.

Q 56 IHVEHTOR J'om H. DURKHOLDER Y B'WW AT-r'rs.

UNITED STATES PATENT OFFICE.

JOHN H. BURKBiOLDEB, OF ASHLAND, OHIO, ASSIGNOR TO THE ELITE MLNUFAG- TUBING COHI'AN'Y, OF 55mm, OHIO, A PARTNERSHIP.

LIFT-TACK.

Specification of Letters 2atent.

Patented May 19, 1914.

To all whom it may concern:

Be it known that I, 'Jornv H. BURK- nonnrm, citizen of the United States, residing at Ashland, in the county of Ashland and State of Ohio, have invented certain new and useful Improvements in LiftJocks, of which the following is a. specification.

This invention consists in a lift jack of new and original construction, as hereinafter fully described and particularly pointed out in the claims.

In the accompanyin drawings, Figure 1 is a side elevation of tie jack partially sectioned and showing the lift member partially raised and the handle at the limit of its up stroke. Fig. 2 is a. view of the pick corresponding to Fig. 1, but showing the active ports as they appear when the handle is down'to the bottom of its stroke after having raised the lift member one notch or tooth. Figs. 3 and 4 show views corresponding to El 1 and 2 except that the lift memher is bein lowered and the active parts in osition to owerit one tooth at each stroke from the lowered osition of the handle in Fig. 3 to the raise position Fig. 4. Fig. 5 is a erspective view of the inner end of the hen le, Fig.6 is u perspective view of the check pawl. Fig. 7 is a. perspective view of the reversin lever and Fig. 8 is a pers ectivc view oi the lift pawl end its spring. 'g. 9 is a perspective view of the upper portion of the standard.

The jack as thus shown 15 of the reversible t pc, being adapted to lift and to lower on o ject by precisely the some movements'of the operating handle and having a. simple mechanism by which the change from one direction of movement to the other can be instantly eifected while the lift member is under a load, all as will hereinafter clearly ap er.

f n the drawings 2 represents the standard, which is cast to a suitable size according to the work for which it is intended, say eight "to twelve inches in height rectangular in cross section. as shown herein and having asuitable base 4 to stand alone. A lift memher 3 in said standard has a. series of ratchet teeth a along its inner edge adapted to be position of the mechanism by which the conversion is effected. The said handle 6 is bifurcated at its inner end or has ears between wh ch the said actuating pawl is pivoted. while u check or holding pawl 8 is mounted on the axis 9 of said handle between said ears next behind pawl 5 and is adapted to engage the said ratchet teeth a. and hold the stud lift member in the interval of change 1) thepawl 5 from one tooth to another. X spring 10 serves tohold the pawl 8 normal forward in working relation to the said lid; member, but its action is modified by the eficct of spring 13 of reversing lever 12 by which the actuating pawl is changed from a lift to a lowering pawl.

When lifting occurs the pawl 8 is in free on glng relations wlth t 1e lift member un er the action of its own spring 10, and

when lowering of the said member occurs the said pawl 8 is under a back pressure by reversing lever l2 under the action of its spring 13. The said lever is pivoted on the mus 9 at the side of the operating handle in a swell or enlargement c on the rear and'top of the standard and which serves as a housing for allthe acti e parts between lift member 3 and handle 6. The pivot or axis 9.

is through the sides of this enlargement or housing, which has a special opening or hole a in its side throlwh which the pawl 5 can be reached by its side pin or projection f and by which the said pawl can be disengaged by hand when desired regardless of the action of the other ports. The said lever" 12 is seated in cavity 9 at the bottom of housing 1.: and engaged at its fixed end with a projection d on the hub of lever 12 radial at all times from axis or pivot 9 but in such relations thereto that in the lift position of the actuating pawl, Figs. 1 and 2, the sprin 13 will exert its ressure to the outside 0% said axis and hol said lever retired and idle and in the lowering of the lift member it will exert its pressure on the other side of said axis and hold said member in raised position to operatively engage pawl 5 as seen in Figs. 3 and 4. The said lever 12 has a. handle extending out beyond the housing a by which one can at will throw said lever into either position across its center and the inner end thereof has a straight top enging portion h and a depression or cavity next thereto adapted to successively enga e the said finger, f on lift pawl 8.

e spring 13 exerts a constant upward be removed or assembled wit action is effected b a eel portion m on said lever pressing against a lateral rejection n on the pawl 8, Fi 3, and in which osition the handle 6 is e ressed. When t e said handle is raised an pawl 5 correspondingly lowered the said projection 1:. bears against the said heel m and depresses the inner end of lever 12 so that the finger f .on awl 5 will be carried Slack over the fiirface intofca'vityv and us inomentcr' y disen' gage rom rack a and allow the holdingpawl to come into action with the second next tooth above. This latter engagement is enforced by curved-projection hen the lever 6 and which bears the said pawl 8 inward into such relation that as the lift member drops it will be caught by said pawl. It will be understood that all these actions are momentary as the handle is operated in a pumping manner up it i 1 6 t d e 1 aw spri l is suppor e on the pivot of said pawl nd its long and bears upon the inside of lever 6 between its ears and its short end presses against a side shoulder on said pawl. This, however, is a mere mechanical contrivence.

Essentially the invention resides in the means" for'convenient-ly and easily raisin and lowering an object, as when engage beneath an automobile axle, and in its conv venicnt convertibility from one use to the other. It is also seen that a single member or part serves to make the change and that in operation everything is automatic Egon the operation of the handle 6. The in also very simple in construction as practically only eleven separate parts are embodied in the complete device, all but three being primarily supported by pivot pin 9 whereby the lever operating arts ma all exceptional convenience and despatch, and the strain on the parts localized at this pin. The standard is also cast in one piece and is provided with ample sized openings and recesses to introduce and confine the operating arts. The flaring ocket particularly distinguishes this evice f om others in that it affords e useful means to confine and prosaid standard and havinglratchet teeth at its edge, on o ernting han e pivoted in said hOllSlIl and aving a lift pawl mounted in the mid thereof adopted to engage said teeth. a pinsupporting said handle in said housing and a pawl mounted on said pin at the side of said handle likewise adapted to engage said liftteeth, and the said pawls arranged to act successively, a reversing le-- ver pivoted at the side of said handle and a sprin for said lever seated within said cavity, t c said first named owl having a projection at its side engaged by the end of said lever and a depression behind said end adapted to throw the said pawl out of en gagement with the said lift member.

2. A lift jack comprising a standard having a housing, a lift member slidable in said standard and having ratchet teeth at its edge, an operating handle pivoted in said housing and having a lift pawl mounted in the end thereof adapted to engage said teeth, apin supporting said handle in saidhousing and a pawl mounted on said pin likewise adapted to engage said lift teeth, and the said pawls arranged to act successively, a, reversing lever pivoted at the side of said handle and a compression spring having an oscillatory movement and. acting to hold said lever in different positions,. the said first named pawl havinga projection at its side engaged bythe end of said lever and a depression behind said end adapted to throw the said pawl out of engagement with the said lift member. s In testimony whereof I afiix my signature in presence of two witnesses.

JOHN H. BURKHOLDER.

Witnesses:

R. B. Mosnn,

F. 0. Museum 

